When I arrived in London,I got down to my work at once.(同义句)

题目

When I arrived in London,I got down to my work at once.(同义句)
________my arrival in London,I began to work ________.
________ ___________I got to/reach London,I started to work.
Although he is a boy,he seems very brave.
________ _______/_________he is,he seems very brave.
第2题中间那一杠是说明要写两种答案

答案

Once； immdiately
The moment
A boy / Boy